NiteRider's Solas Taillight has some sweet features, one of those being an impressive battery life. Clocking in at a minimum of 6.5 hours and a maximum of 40 hours, this light would probably endure longer than a 150 mile ride! This reliable light has four modes, 2 designed for night and 2 designed for day (DVF) and a light indicator for when the battery life does get low.